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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (3): 411-420.doi: 10.11872/j.issn.1005-2518.2021.03.007

• 采选技术与矿山管理 • 上一篇    下一篇

高强弹体侵彻白麻花岗岩靶体的数值模拟研究

黄进(),刘科伟(),靳绍虎   

  1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2020-12-27 修回日期:2021-03-12 出版日期:2021-06-30 发布日期:2021-07-14
  • 通讯作者: 刘科伟 E-mail:hj_changsha@csu.edu.cn;kewei_liu@126.com
  • 作者简介:黄进(1996-),男,广西贵港人,硕士研究生,从事岩土工程方面的研究工作。hj_changsha@csu.edu.cn
  • 基金资助:
    湖南省自然科学基金项目“爆破荷载下应力波空间变化特性与结构响应机理研究”(2018JJ3656)

Numerical Simulation Study of High-strength Projectile Penetrating White Granite Target

Jin HUANG(),Kewei LIU(),Shaohu JIN   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2020-12-27 Revised:2021-03-12 Online:2021-06-30 Published:2021-07-14
  • Contact: Kewei LIU E-mail:hj_changsha@csu.edu.cn;kewei_liu@126.com

摘要:

为了研究白麻花岗岩在高强度弹体中高速侵彻条件下的力学损伤响应,运用显式动力学有限元分析软件LS-DYNA,应用经SHPB试验验证的HJC材料模型,开展了弹头形状系数为3、直径为?20 mm、长径比为6的刚性弹体以不同初速度侵彻白麻花岗岩靶体的一系列数值模拟研究。同时,针对传统有限元方法难以解决材料大变形导致的网格畸变等问题,采用SPH-FEM耦合方法对靶体进行建模。通过改变弹体配置,研究了不同弹头形状对弹体侵彻性能的影响。模拟结果表明:SPH-FEM方法可以有效模拟岩石靶体受高速冲击的力学损伤响应。由不同撞击速度与侵彻深度的关系得到了有关白麻花岗岩侵彻深度的经验公式,其中侵彻深度与撞击速度呈正比,经验公式可用于相似强度岩体的侵彻深度预测。当初速度为50,100,150,200,250,300 m/s时,平头弹侵彻深度分别为卵形弹侵彻深度的16.7%、27.8%、35.1%、32.1%、36.1%和40.5%,平头弹的侵彻性能远低于卵形弹,且侵彻损伤区域较小。

关键词: 岩石力学, 数值模拟, 力学损伤, 侵彻性能, 经验公式, SPH-FEM耦合方法

Abstract:

It is of great significance to investigate the penetration effect of high strength projectile on rock mass for the development of rock breaking technology in mine drilling.The penetration process is a process with large deformation of material.It is difficult for traditional finite element method to solve the problem with large deformation,which will lead to mesh distortion and calculation disruption.In order to obtain the damage responses of white granite under the condition of high speed penetration,the HJC material model was employed to model the white granite target and the projectile was assumed to be rigid.The HJC model was calibrated by the SHPB test data and the results show that the HJC model is capable to model the mechanical behavior of white granite under high strain rate conditions.The nonlinear finite element analysis software LS-DYNA was utilized and an SPH-FEM coupled method was developed to overcome the penetration problem with large deformation of granite target.A series of numerical simulation of projectile impacting white granite target with different velocity were carried out.The projectile is with diameter of 20 mm,CRH of 3 and length-diameter ratio of 6.The simulation results show that the SPH-FEM method can effectively simulate the mechanical damage response of rock target subjected to high speed impact.Based on the relationship between different impact velocities and penetration depth,an empirical formula for penetration depth of white granite is obtained,which can be used to predict the penetration depth of rock mass with similar strength.Finally,the effects of different nose shapes on penetration performance was studied. The results show that the penetration performance of flat-nose projectile is much lower than that of ogive-nose projectile,and the penetration damage area is smaller.The penetration depths of flat-nose projectile at initial velocity of 50,100,150,200,250 and 300 m/s are 16.7%,27.8%,35.1%,32.1%,36.1%,40.5% of the penetration depths of ogive-nose projectile,respectively.

Key words: rock mechanics, numerical simulation, mechanical damage, penetration performance, empirical formula, SPH-FEM coupling method

中图分类号: 

  • TJ410

图1

Φ50 mm×50 mm白麻花岗岩试样"

表1

白麻花岗岩HJC模型参数取值"

参数名称数值参数名称数值
密度ρ0/(kg·m-32 607锁定压力Pl/GPa3.47
准静态单轴抗压强度fc/MPa89.4锁定体积应变μl0.02
归一化内聚强度A0.3压实压力Pc/MPa29.8
归一化硬化压力B2.0压实体积应变μc2.1E-3
压力硬化指数N0.79压力常数K1/GPa116
应变率系数C0.003 6压力常数K2/GPa-243
最大拉伸静水压力T/MPa4.56压力常数K3/GPa506
剪切模量G/GPa9.88损伤常数D10.04
归一化最大强度Smax7损伤常数D21.0
断裂塑性应变EFMIN0.01准静态应变率EPS01.0

表2

白麻花岗岩不同应变率下的压缩强度"

应变率压缩强度/MPa等效强度
10-489.41.00
121131.01.47
140139.01.56
155143.01.60

图2

SHPB试验模型局部示意图"

图3

入射杆、透射杆应变信号(a)和试样应力平衡图(b)"

图4

不同应变率下室内试验与数值模拟获得的真实应力—应变曲线的比较"

图5

计算模型网格布置示意图"

图6

测点布置示意图"

图7

靶体历史压力云图及各测点处峰值压力衰减规律"

图8

初速度为250 m/s时的靶体历史损伤云图"

图9

初速度为500 m/s时的靶体历史损伤云图"

图10

白麻花岗岩模拟侵彻深度与经验公式的比较"

图11

相同动能平头弹与卵形弹侵彻深度的对比"

图12

初速度为250 m/s的平头弹与卵形弹对靶体最终损伤区域对比"

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